[1967gto1]

I have been working on my gauges and dash harness on my 67 gto. I've started hooking all the wires back on to the gauges and other things. I did not do the best job of documenting how everything went back together. My question is, there are two wires that are connected to what look like silver bullets. One I labeled going to the ignition but the other one I did not label. I think it goes to the cigarette lighter. It has a white wire. The one going to the ignition is just loose in the hole. It doesn't seem to fit well. The other one I haven't tried to install yet. Does anyone know what the silver bullet things do? Any help would be appreciated.